US Patent: 1,510,219
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| Auger Guide
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Patentee:
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| Roswell B. Harding (exact or similar names) - Buckley, WA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Oct. 17, 1923 |
| Granted: |
Sep. 30, 1924 |
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Russ Allen.
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Description: |
| Square with two angle brackets clamped together to assist in boring straight holes. |
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